Ahhh I think this is it - Bradycardia-tachycardia syndrome is a variant of sick sinus syndrome in which slow arrhythmias and fast arrhythmias alternate.
is that what you're referring to?
are you having both together, on a daily basis etc?
I know there are some who have something similiar; but Im having a major brain fog remembering. WPW, SSS I just can't remember what it is - when I find it I'll post and let you know, hopefully in the mean time someone will chime in :)
http://en.wikipedia.org/wiki/Bradycardia
http://en.wikipedia.org/wiki/Tachycardia